JP2009172995A - Thermoplastic resin-coated FRP filament and method for producing the same - Google Patents

Abstract

The present invention relates to a thermoplastic resin-coated FRP filament having a thermoplastic resin-coated FRP filament used as a drop optical cable tension member or the like and having a thinner outer diameter and a thinner outer diameter, and a method for producing the same. To provide.
A bundle of reinforcing fibers made of organic synthetic fibers is impregnated with an uncured thermosetting resin composition, and then a coating layer made of a thermoplastic resin is formed on the outer peripheral surface of the wire article drawn into a predetermined shape. After forming and cooling and solidifying the coating layer, the thermosetting resin is cured, and thereafter, the outer diameter of the coating layer is adjusted, and the thermoplastic resin-coated FRP filament 6 is the uncured product. The thermosetting resin composition comprises 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the thermosetting resin, and is coated with a thermoplastic resin excellent in buckling resistance This is the FRP filament 6.
[Selection] Figure 2

Description

  The present invention relates to a thermoplastic resin-coated FRP filament having a reduced outer diameter used as a tension member for a non-metallic drop optical cable and a method for producing the same.

With the arrival of the information society and the increase in transmission information capacity such as the Internet, FTTH has been rapidly progressing to install optical fiber cables to subscribers such as buildings and houses.
As a drop optical fiber cable for FTTH, one using a metal wire as a tension member (hereinafter sometimes referred to as TM) has been proposed. However, grounding is necessary to avoid surging due to lightning. The labor and construction cost increased, and there was a problem in the spread to each home.
Therefore, a non-metallic drop optical fiber cable that eliminates the need for grounding work by using non-metallic TM such as FRP (fiber reinforced synthetic resin) wire instead of metal wire TM has been studied. Drop optical fiber cables of the type are mainstream.

The present applicant, as a non-metallic drop optical fiber cable, has an FRP tensile body (TM) in which the inner periphery of a thermoplastic resin coating layer and the outer periphery of an FRP tensile body are anchor-bonded, and an optical fiber. A main body covering portion that covers the core wire, the coated FRPTM, and the optical fiber core wire together with a thermoplastic resin, and the outer periphery of the coated FRPTM and the main body covering portion are fused together. As a result, Patent Document 1 proposed that the main body covering portion and the FRP strength member are anchor-bonded.
In addition, the present applicants, in manufacturing a drop optical fiber cable, in order to eliminate the phenomenon of foaming of the main body covering portion or the covering portion of the coated FRP tensile strength member, in the FRP tensile strength member for drop optical fiber cable, Patent Document 2 proposes to limit the amount of residual styrene monomer in the FRP part to 0.03% by weight or less.

  In addition, as shown in Patent Document 2, in the coated FRP strength member, the surface of the thermoplastic resin coating layer is sized, but the accuracy of the outer diameter is determined by the surface roughness measured by a laser outer diameter measuring instrument. It has also been found that a thickness of 2/3/100 mm or less is desirable in order to prevent the occurrence of foaming troubles when the main body is coated.

In order to obtain such surface irregularity, as shown in Patent Document 3, a method of cutting the outer skin (surface coating layer) by passing a coated FRP strength member through a preheating die and a shaping die is used. It was done.
However, if the temperature of the long high-temperature steam curing tank is set to about 150 ° C. and the production rate is increased to 30 m / min or 50 m / min in order to reduce the residual styrene concentration, melting of the polyethylene resin used for the coating layer There is a problem that objects accumulate on contact points such as guides, and they adhere to the thermoplastic resin-coated FRP filaments as abnormal parts, and these abnormal parts cause excessive resistance in the preheating die part. There were many events that caused cutting of the filaments and peeling of the coating, and forced to cut halfway.

Recently, TMs of long products (25 km, 50 km, etc.) have been demanded due to demands for improving production efficiency in the manufacturing process of drop optical fiber cables.
However, as described above, the manufacturing conditions of the coated FRP strength member are more severe, so in a long curing tank, the molten thermoplastic resin accumulates in the shutter and guide, and this is the wire that travels. In some cases, it may become a foreign material extremely larger than the diameter of the wire due to adhesion, etc., which causes diameter adjustment troubles such as coating breakage and causes a decrease in yield of long products.
In particular, the outer diameter of the thermoplastic resin coating of the drop optical fiber cable TM is very thin, 0.6 to 0.8 mm, and the outer diameter of the FRP is 0.4 mm or 0.5 mm. When the accuracy is adjusted by adjusting the diameter, 0.15 mm, especially when a diameter adjustment trouble such as coating breakage due to a foreign material extremely larger than the above-mentioned wire diameter occurs, a product having a good surface condition is reduced to 25 km. It was difficult to manufacture with a long length of 50 km or the like.

Furthermore, in recent years, there has been a frequent occurrence of accidents in which a drop of an optical fiber punctures an oviduct into a drop optical cable and damages the optical fiber. As a countermeasure, a structure in which a polyamide resin tape is provided as protective walls on both sides of the optical fiber core wire has been adopted. However, since the external dimensions of the drop optical cable are the same as before, further reduction in the diameter of the tension member has been required. Further, the drop optical cable is required to have flame retardancy, and flame retardant polyethylene is adopted as a body coating resin that integrally covers the support wire, the tension member, the optical fiber core wire, and the protective wall. Along with this flame retardancy, 1) The flame retardant polyethylene has a high melt resin viscosity and the tension member does not wrap around unless the diameter of the tension member is reduced. 2) When the body is coated, the tension member moves outward from the body coating. 3) There was a problem that the flame retardant effect was reduced by the coating resin of the tension member that was not flame retardant.
From the above problems, the FRP outer diameter remains functionally 0.4 to 0.5 mm, and the thermoplastic resin coating outer diameter is 0.55 to 0.6 mm, that is, the coating thickness is 0.05 to 0.75 mm. Requested development.
Drop optical fiber cables are often used as indoor wiring after branching from a support wire, so the FRP filament used as a tension member must have buckling resistance that does not buckle even when bent to a small diameter. Even in this development, a minimum bending diameter of less than 5 mm at the current level was required.

This buckling resistance will be supplementarily described. In general, when a rod-shaped FRP filament is bent, tensile strain is applied to the reinforcing fiber portion outside the bending center, and compressive strain is applied to the inner fiber portion. In particular, in the compression strain region, the fiber is buckled, and the fiber itself tends to have a wavy shape. In particular, in the case of organic fibers, the effect of buckling in the compression region is greater than the effect of breaking in the tensile region, and it can be said that the bending of the FRP rod of the organic fiber is mainly due to buckling.
From this point, the buckling resistance is particularly required in the FRP rod using organic fibers such as aramid fibers as reinforcing fibers.

In the conventional manufacturing method relating to the thermoplastic resin-coated FRP filament, the thermoplastic resin coating layer functions as a “mold” until the uncured FRP is cured. ) The shape (roundness) of FRP cannot be maintained. 2) When passing through the curing tank, it may break if it is thin because it hits the inner surface of the tank. 3) Since the discharge amount of the coating layer decreases, the same speed 4) It becomes easy to break the coating 4) It is easily affected by foreign matter and gel contained in polyethylene 5) In the sizing process of cutting the coating, it is said that it is more difficult to cut evenly There was a situation.
As described above, the thermoplastic resin-coated FRP filaments in which the thermoplastic resin-coated FRP filaments are thinned to a thickness of about 0.02 to 0,1 mm to reduce the outer diameter, and No proposal for a manufacturing method has been made.

Japanese Patent Laid-Open No. 2004-163501 JP 2005-172939 A Japanese Patent Publication No. 63-58691 Japanese Examined Patent Publication No. 63-2772

  The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to provide a thermoplastic resin coating thickness of a thermoplastic resin coated FRP filament used as a tension member for a drop optical cable. An object of the present invention is to provide a thermoplastic resin-coated FRP filament having excellent buckling resistance, which is thinned and has a reduced outer diameter, and a method for producing the same.

  As a result of diligent research to achieve the above object, the present inventor has uncured thermosetting containing 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the thermosetting resin in the aromatic polyamide fiber bundle. It has been found that the above-mentioned problems can be solved by impregnating with a conductive resin.

That is, the present invention
(1) After impregnating a reinforcing fiber bundle made of organic synthetic fiber with an uncured thermosetting resin composition, a coating layer made of a thermoplastic resin is formed on the outer peripheral surface of a wire article drawn into a predetermined shape. A thermoplastic resin-coated FRP filament obtained by cooling and solidifying the coating layer, curing the thermosetting resin, and then adjusting the outer diameter of the coating layer, the uncured thermosetting Thermoplastic resin-coated FRP filaments excellent in buckling resistance, wherein the curable resin composition contains 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the thermosetting resin object,
(2) The thermoplastic resin-coated FRP filament according to (1), wherein the diameter is 0.7 mm or less,
(3) The thermoplastic resin-coated FRP filament according to (1) or (2), wherein the thickness of the thermoplastic resin coating layer is 0.02 to 0.1 mm,
(4) The thermoplastic resin-coated FRP filament according to any one of (1) to (3), wherein the thermosetting resin is a vinyl ester resin,
(5) The thermoplastic resin coating according to any one of (1) to (4), wherein the tensile modulus of the organic synthetic fiber is 360 cN / dtex or more and the elongation at break is 3.5% or more. FRP filaments,
(6) The thermoplastic resin-coated FRP filament according to any one of (1) to (5), wherein the organic synthetic fiber is an aromatic polyamide fiber,
(7) The thermoplastic resin-coated FRP filament according to any one of (1) to (6), wherein the thermoplastic resin is linear low-density polyethylene, and (8) a reinforcing fiber bundle comprising organic synthetic fibers A mixture impregnated with an uncured thermosetting resin is drawn into a predetermined shape to form an uncured filament, and this is coated with a molten thermoplastic resin, and the coating resin is cooled and solidified. This is a method for producing a thermoplastic resin-coated FRP filament, which is introduced into a pressurized steam curing tank to cure the thermosetting resin, and then adjusts the outer diameter of the thermoplastic resin coating layer. Production of a thermoplastic resin-coated FRP filament having excellent buckling resistance, containing 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the uncured thermosetting resin Method,
Is to provide.

The thermoplastic resin-coated FRP filaments of the present invention can be effectively used as a tension member of a drop optical cable in which a tape for countermeasures against bear wiping that is required to be reduced in diameter is disposed.
Further, since the thickness of the coated thermoplastic resin layer is reduced, it is possible to reduce raw material costs, improve handling by reducing unit weight, reduce packing material costs, transportation costs, and storage costs.
Furthermore, the production method of the present invention can stably produce a long product of the thermoplastic resin-coated FRP filament having the above-described characteristics, and can improve productivity and yield (yield).

  The thermoplastic resin-coated FRP filament of the present invention is obtained by impregnating a reinforcing fiber bundle made of organic synthetic fibers with an uncured thermosetting resin composition, and then drawing the outer periphery of the filament formed into a predetermined shape. A thermoplastic resin-coated FRP filament formed by forming a coating layer made of a thermoplastic resin, cooling and solidifying the coating layer, curing the thermosetting resin, and then adjusting the outer diameter of the coating layer And the said uncured thermosetting resin composition contains 0.5-3 mass parts of calcium carbonate with respect to 100 mass parts of the said thermosetting resins, It is characterized by the above-mentioned.

  Embodiments of the thermoplastic resin-coated FRP filament of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a drop optical fiber cable using the thermoplastic resin-coated FRP filament (coated FRP) of the present invention as a tension member (TM). The drop optical fiber cable 1 shown in FIG. 1 includes an optical fiber core wires 2 and 3, a coated FRPTM 6, a support wire 7, and a polyamide resin as a protective wall for anti-bearing on both sides of the optical fiber core wires 2 and 3. A tape 10 is provided. The optical fiber core wires 2 and 3 are disposed so as to be adjacent to each other vertically in the center. The coated FRPTM 6 is formed in a circular cross section in which FRP 4 made of an organic synthetic fiber reinforced thermosetting resin is coated with a coating layer 5 made of a thermoplastic resin. 3 are arranged on the same axis so as to sandwich a predetermined interval above and below 3. The support wire 7 is disposed above one of the coated FRPTMs 6, and the optical fiber core wires 2 and 3, the coated FRPTM 6 and the support wires 7, and the polyamide resin tape 10 are made of a thermoplastic resin body covering portion. 8 is configured to be collectively covered.

The coated FRPTM 6 is obtained by applying a thermoplastic resin coating layer 5 to the FRP tensile body 4, and the outer periphery of the FRP tensile body 4 and the inner periphery of the coating layer 5 are anchor-bonded to each other.
In order to obtain anchor adhesion, the method described in Patent Document 4, that is, an uncured reinforcing core portion obtained by impregnating a reinforcing fiber bundle with an uncured thermosetting resin is coated with a molten thermoplastic resin. Immediately thereafter, the thermoplastic resin coating layer is cooled and solidified, and then guided to a curing tank of pressurized high-temperature steam, while the reinforcing core portion and the interface portion of the coating layer are softened and contacted in a fluid state. It can be obtained by a method in which the thermosetting resin is heat-cured and subsequently the coated thermoplastic resin is cooled.

  The thermoplastic resin-coated FRP filament 6 of the present invention has a diameter of 0.7 mm or less from the viewpoint of securing a minimum bending diameter of less than φ5 mm and ensuring the wrapping of the flame-retardant resin when the drop optical cable body is coated with resin. It is preferable that

  In addition, if the thermoplastic resin coating layer has an unnecessarily thick thickness, it becomes an impediment to flame retardancy. Therefore, the coating layer 5 preferably has a coating thickness of 0.02 to 0.1 mm after sizing. . Along with this, the diameter of the uncured FRP after melt coating cooling (elementary wire diameter) is 0.70 to 0.85 mm and the coating thickness is approximately 0.05 to 0.1 mm. This is desirable from the viewpoint of expressing a continuous curing mold function in the curing step of the curable resin and obtaining an FRP closer to a perfect circle.

Examples of organic synthetic fibers as reinforcing fibers that can be used in the thermoplastic resin-coated FRP filaments to which the thermoplastic resin-coated FRP filaments of the present invention can be applied include aromatic polyamide fibers (aramid fibers) and polyarylate fibers. , Polyparaphenylene benzobisoxazole (PBO) fiber, polyparaphenylene benzobisthiazole (PBT) fiber, and the like.
These organic synthetic fibers preferably have a tensile elastic modulus of 360 cN / dtex or more and an elongation at break of 3.5% or more.
If the tensile elastic modulus is 360 cN / dtex or more, it has a tensile strength for protecting the optical fiber, and if the elongation at break is 3.5% or more, the FRP is less likely to bend. Sufficient buckling resistance without hindering handling and wiring work after the drop optical fiber cable.
An even more preferable tensile elastic modulus is 480 cN / dtex or more.
As the organic synthetic fiber to be used, a so-called multifilament-shaped fiber having a single fiber diameter of 10 to 15 μm and not twisting a plurality of yarns is desirable, and 500 to 2000 dtex is used. In this case, when a reinforcing fiber having a large count, that is, a reinforcing fiber exceeding 2000 dtex is used, the roundness of the FRP is adversely affected, and a uniform coating is performed in the subsequent thin-wall coating process using the thermoplastic resin. Becomes difficult. In addition, the single yarn is poorly aligned, and there is a possibility that the tensile performance becomes insufficient when it is made into FRP. On the other hand, yarns of 500 dtex or less are also commercially available, but the process becomes complicated and the cost increases, which is not economical.

  In addition, the organic synthetic fiber is preferably an aromatic polyamide fiber because it has been used for the purpose of reducing the diameter and weight. Aromatic polyamide fibers can be broadly classified into meta and para types, regardless of their type. For example, polyparaphenylene terephthalamide fibers (trade name “Kevlar”), Teijin sold by Toray DuPont Co., Ltd. Examples thereof include aramid fibers such as “Technola” and “Twaron” para-aramid fibers sold by the corporation.

  The volume content of the reinforcing fiber of the FRP tensile strength body 4 is determined by the required physical properties, but in the present invention for the purpose of further reducing the diameter, it is generally 50 to 70 Vol. % Is desirable.

  Further, in the thermoplastic resin-coated FRP filament of the present invention, the thermosetting resin that can be used for binding organic synthetic fibers as reinforcing fibers is terephthalic acid-based or isophthalic acid-based unsaturated polyester resin, vinyl ester resin. (Epoxy acrylate resins, etc.) or epoxy resins are common, and these are used after adding a curing catalyst, etc. Especially, vinyl ester resins (epoxy acrylate resins, etc.) are from the viewpoint of physical properties such as heat resistance. preferable.

The average particle diameter of calcium carbonate is preferably 3 μm or less from the viewpoint of sedimentation in a resin impregnation tank, prevention of thermoplastic resin coating breakage, uniform dispersibility in the FRP portion, and the like.
The addition amount of calcium carbonate is 0.5 to 3 parts by mass with respect to 100 parts by mass of the thermosetting resin. When the addition amount is in the range of 0.5 to 3 parts by mass, the outer diameter variation rate of the thermoplastic resin-coated FRP filament is low, has minimum bending characteristics, and can be used as a tension member of an optical drop cable.

  The thermoplastic resin used for the coating layer 6 of the uncured reinforcing core portion is selected from resins that are compatible with the thermoplastic resin of the main body coating portion 8. Moreover, in the manufacturing process of FRPTM with a coating | cover, it is preferable to use a transparent thermoplastic resin from the point which the state of the outer periphery of a FRP part, the uneven thickness of a covering thermoplastic resin layer, etc. are easy to confirm.

Further, the thermoplastic resin used for the coating layer 5 is preferably a molten or softened state at least at the inner periphery when the thermosetting resin is heat-cured in order to obtain an anchor adhesion structure with the FRP strength member 4. A polyolefin resin having a melting point or softening point in the temperature range of 110 to 150 ° C. is more preferable.
The degree of anchor adhesion is preferably such that the pulling force of the FRP strength member 4 from the thermoplastic resin used for the coating layer 5 is 10 N / 10 mm or more.

  In order to make the thickness of the coating layer 5 about 0.02 to 0.1 mm after sizing, a resin having good thin film formability is desirable. For example, low density polyethylene (LDPE), linear low density polyethylene ( LLDPE) is preferred.

In the case of using LLDPE, it is more preferable to use one having the following characteristics. The properties are as follows: MFR according to JIS K6760 is 1 to 4 g / 10 min, density is 0.920 to 0.940 g / cm ³ , and tensile strength is 30 MPa or more in a tensile test according to JIS Z1702, and 1% modulus is 150 to 150%. Those having a value in the range of 250 MPa are preferred. Moreover, you may mix and use 2 types of resin of different MFR whose MFR is the range of 1-4 g / 10min.

Next, a method for producing the thermoplastic resin-coated FRP filament of the present invention will be described with reference to FIG.
Prepare the required number of reinforcing fibers 11 composed of organic synthetic fibers selected according to the required tensile strength and bending resistance according to the fiber volume content of the FRP layer, and store them in an uncured thermosetting resin The impregnated tank 12 is passed through the impregnated tank 12 to impregnate the reinforcing fibers with an uncured thermosetting resin, and subsequently, the inner diameter of the through hole is the same as the outer diameter of the FRP portion to be obtained. The outer periphery of the uncured filaments drawn to a predetermined diameter through a plurality of squeezing nozzles 13 that are sequentially reduced in diameter toward the outer periphery is coated by extruding a thermoplastic resin for coating in an annular form from a melt extruder 14; This is led to the cooling water tank 15 to cool and solidify the thermoplastic resin coating layer on the surface, and then inserted into the pressurized steam curing tank 16 sealed at both ends to bring the thermoplastic resin coating layer into a melt-softened state. It has undergone fluid contact under pressure at the interface with the curable resin. The internal thermosetting resin is cured, and thereafter, the coated FRP strand 6 ′ cooled in the cooling water tank 17 is formed. Then, the diameter is adjusted to a predetermined product diameter by the diameter adjusting device 18, and the outer diameter inspection device 19 is set. Then, it is wound around the bobbin 20 by the winding device.

  As shown in FIG. 3, the manufacturing apparatus 18 for adjusting the diameter includes a base block 21, a preheating mold block 22, a first diameter adjusting mold block 23, and a second diameter adjusting mold block 24, respectively. They are closely arranged via a heat insulating material layer 25 interposed therebetween. A heater 26 is embedded in each of the mold blocks 22, 23, 24, and dies 31, 32, 33 are disposed along the insertion direction of the supplied coated FRP strand 6 ′.

  Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to these examples.

Example 1
This embodiment will be described with reference to FIG. As the reinforcing fiber bundle 11, a single multifilament of para-aramid fiber (manufactured by Toray DuPont: Kevlar 29, single yarn diameter 12 μm, 1670 dtex) having a breaking elongation of 3.6% and a tensile elastic modulus of 490 cN / dtex was used. A mixed catalyst of 100 parts by weight of vinyl ester resin (made by Showa High Polymer, R3130), 4 parts by weight of Kadaku Akzo's trade name “Cadox BCH50” as a thermosetting catalyst, and 1 part by weight of “Kayabutyl B”, and Nitto Flour Industry Co., Ltd., lead to uncured thermosetting resin impregnation tank 12 to which 1 part by mass of calcium carbonate (NS # 200, average particle size of about 2.0 μm) is added, and thermosetting resin is applied to the reinforcing fiber bundle. Impregnated. Subsequently, the reinforcing fiber bundle impregnated with the uncured resin is drawn by drawing it to the drawing nozzle 13 whose inner diameter is gradually reduced, and a thin filament having an outer diameter of 0.490 mm is obtained. It is passed through a crosshead die (200 ° C.) of the melt extruder 14 and coated in an annular shape with a coating thickness of about 0.13 mm by LLDPE (manufactured by Nihon Unicar, NUCG5225 / NUCG5361 = 1: 1 blend product), and immediately a cooling water layer 15 to cool and solidify the coating on the surface.
Subsequently, the LLDPE-coated uncured linear material was introduced at a speed of 50 m / min into a pressurized steam curing tank 16 having a length of 36 m provided with pressure seal portions at the inlet and outlet at 150 ° C. (0.4 Mpa). Cured and continuously supplied as a thermoplastic resin-coated FRP filament with a coating outer diameter of about 0.77 mm to a diameter adjusting device 18 equipped with a diameter adjusting die with a final inner diameter of 0.605 mm. A thermoplastic resin-coated FRP filament having an outer diameter of 0.60 mm was obtained. The reinforcing fiber content of the FRP part is 63 Vol. %Met.
With respect to the obtained thermoplastic resin-coated FRP filament, the minimum bending diameter was measured by the following method. That is, the sample was bent into an arc shape, the bending diameter was reduced, the bending diameter (inner diameter) at which cracks and breaks occurred was measured 6 times, and the maximum value was taken as the minimum bending diameter. The minimum bending diameter obtained at this time was 4 mm, and it was confirmed that the buckling resistance was excellent.
This was passed through a laser outer diameter inspector 19 to perform a full length inspection, and wound around a predetermined plastic bobbin 20 to obtain a thermoplastic resin-coated FRP filament product having a length of 50 km.
The time required for 50 km production was 1000 minutes (16.7 hours), and the outer diameter fluctuation rate by the laser outer diameter inspection device 19 during this period was 3.3%.

Example 2
When continuous production of a fixed length product of 50 km / piece was performed for one month under the same conditions as in Example 1, the production was extremely stable, and the fixed length product could be manufactured with a probability of 85% or more. .

Comparative Example 1
When a thermoplastic resin-coated FRP filament was produced in the same manner as in Example 1 except that calcium carbonate was not added, the coating was broken immediately after coating, and the coating was intermittently broken in the curing tank or with a controlled diameter. Thus, continuous production of 50 km was impossible.
The coating breakage was due to deformation in the uncured FRP, uneven thickness of the coating resin, or uneven diameter adjustment (shaving) with a diameter adjusting nozzle. The variation rate of the outer diameter by the laser outer diameter tester 19 was 6.5%.

Comparative Example 2
A thermoplastic resin-coated FRP filament was produced in the same manner as in Example 1 except that the amount of calcium carbonate was changed to 4 parts by mass.
As a result of evaluating the minimum bending diameter, continuous productivity, and sizing property of the obtained thermoplastic resin-coated FRP filament, there was no problem with continuous productivity or sizing property, but the minimum bending diameter was large, It was inferior in flexibility.

Example 3
A thermoplastic resin-coated FRP filament was produced in the same manner as in Example 1 except that the amount of calcium carbonate was changed to 2.5 parts by mass.
As a result of evaluating the minimum bending diameter, continuous productivity, and sizing property of the obtained thermoplastic resin-coated FRP filament, there was no problem in continuous productivity and sizing property, and the minimum bending diameter was also satisfactory. .
The evaluation results of Examples and Comparative Examples are shown together in Table 1.

In Table 1, the evaluation of buckling resistance, continuous productivity, and diameter adjusting property is as shown below.
-Buckling resistance: (circle) = minimum bending diameter is less than 5 mm. X = Minimum bending diameter is 5 mm or more.
-Continuous productivity: ○ = 50 km wound product can be manufactured stably by continuous production. A = 50 km wound product can be manufactured stably for one month continuously. X = It is difficult to stably produce a product with a winding of 50 km.
-Diameter adjusting property: O = There is no occurrence of a diameter adjusting trouble when manufacturing a product of 50 km winding. X = Troubles in diameter adjustment occur during the manufacture of a product with 50 km winding, and continuous production of 50 km winding is impossible.

The thermoplastic resin-coated FRP filamentous material of the present invention can be effectively used as a tension member of a drop optical cable in which a tape for countermeasures against bear wiping that is required to be reduced in diameter is disposed.
In addition, since the coated thermoplastic resin layer is made thinner, it can be used as an economical drop optical cable tension member with reduced raw material costs, improved handling by reducing unit weight, packing material costs, transportation costs, and storage costs. Available.
Furthermore, the production method of the present invention can stably produce a long product of the thermoplastic resin-coated FRP filament having the above-described characteristics, and can improve productivity and yield (yield). Available as

It is explanatory drawing of the usage example of the thermoplastic resin coating | cover FRP filament obtained by the manufacturing method of this invention. It is explanatory drawing of the process example of the manufacturing method of the thermoplastic resin coating | cover FRP filament of this invention. It is explanatory drawing of the structural example of the diameter adjusting device used for manufacture of the thermoplastic resin coating | cover FRP filament of this invention.

Explanation of symbols

1 Drop optical fiber cable 2, 3 Optical fiber core 4 FRP tension member (strength body)
5 Thermoplastic resin coating layer 6 Thermoplastic resin coated FRP filaments (FRPTM with coating)
6 'Thermoplastic resin coated FRP filament strand 7 Support wire 8 Body coating layer 10 Polyamide resin reinforcing tape 11 Reinforcing fiber 12 Impregnation tank 13 Drawing nozzle 14 Melting extruder 15, 17 Cooling water tank 16 Pressurized steam curing tank 18 Preparation Diameter device 19 Outer diameter inspection device 20 Winding bobbin 21 Base block 22 Preheating mold block 23, 24 First and second diameter adjusting mold block 25 Heat insulating material 26 Heater 28 Thermocouple 31, 32, 33, 40 Dies 34 pin gauge 35 bolt

Claims (8)

  After impregnating a reinforcing fiber bundle made of organic synthetic fiber with an uncured thermosetting resin composition, a coating layer made of a thermoplastic resin is formed on the outer peripheral surface of the wire article drawn into a predetermined shape, and the coating A thermoplastic resin-coated FRP filament formed by cooling and solidifying a layer, then curing the thermosetting resin, and then adjusting the outer diameter of the coating layer, the uncured thermosetting resin composition A thermoplastic resin-coated FRP filament having excellent buckling resistance, wherein the product contains 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the thermosetting resin.   The thermoplastic resin-coated FRP filament according to claim 1, having a diameter of 0.7 mm or less.   The thermoplastic resin-coated FRP filament according to claim 1 or 2, wherein the thickness of the thermoplastic resin coating layer is 0.02 to 0.1 mm.   The thermoplastic resin-coated FRP filamentous article according to any one of claims 1 to 3, wherein the thermosetting resin is a vinyl ester resin.   The thermoplastic resin-coated FRP filament according to any one of claims 1 to 4, wherein the organic synthetic fiber has a tensile elastic modulus of 360 cN / dtex or more and an elongation at break of 3.5% or more.   6. The thermoplastic resin-coated FRP filament according to any one of claims 1 to 5, wherein the organic synthetic fiber is an aromatic polyamide fiber.   The thermoplastic resin-coated FRP filamentous material according to any one of claims 1 to 6, wherein the thermoplastic resin is linear low-density polyethylene.   A mixture in which a reinforcing fiber bundle made of organic synthetic fibers is impregnated with an uncured thermosetting resin is drawn into a predetermined shape to obtain an uncured filament, and this is coated with a molten thermoplastic resin, After the coating resin is cooled and solidified, it is introduced into a pressurized steam curing tank to cure the thermosetting resin, and then the outer diameter of the thermoplastic resin coating layer is adjusted to obtain a thermoplastic resin-coated FRP wire. A method for producing a strip, characterized by containing 0.5 to 3 parts by mass of calcium carbonate with respect to 100 parts by mass of the uncured thermosetting resin, and having excellent buckling resistance. A method for producing a plastic resin-coated FRP filament.

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